| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.jface.text; |
| |
| import java.text.BreakIterator; |
| import java.text.CharacterIterator; |
| |
| |
| /** |
| * Standard implementation of <code>ITextDoubleClickStrategy</code>. |
| * Selects words using <code>java.text.BreakIterator</code> for the |
| * default locale. This class is not intended to be subclassed. |
| * |
| * @see java.text.BreakIterator |
| */ |
| public class DefaultTextDoubleClickStrategy implements ITextDoubleClickStrategy { |
| |
| |
| /** |
| * Implements a character iterator that works directly on |
| * instances of <code>IDocument</code>. Used to collaborate with |
| * the break iterator. |
| * |
| * @see IDocument |
| * @since 2.0 |
| */ |
| static class DocumentCharacterIterator implements CharacterIterator { |
| |
| /** Document to iterate over. */ |
| private IDocument fDocument; |
| /** Start offset of iteration. */ |
| private int fOffset= -1; |
| /** Endoffset of iteration. */ |
| private int fEndOffset= -1; |
| /** Current offset of iteration. */ |
| private int fIndex= -1; |
| |
| /** Creates a new document iterator. */ |
| public DocumentCharacterIterator() { |
| } |
| |
| /** |
| * Configures this document iterator with the document section to be iteratored. |
| * |
| * @param document the document to be iterated |
| * @param iteratorRange the range in the document to be iterated |
| */ |
| public void setDocument(IDocument document, IRegion iteratorRange) { |
| fDocument= document; |
| fOffset= iteratorRange.getOffset(); |
| fEndOffset= fOffset + iteratorRange.getLength(); |
| } |
| |
| /* |
| * @see CharacterIterator#first() |
| */ |
| public char first() { |
| fIndex= fOffset; |
| return current(); |
| } |
| |
| /* |
| * @see CharacterIterator#last() |
| */ |
| public char last() { |
| fIndex= fOffset < fEndOffset ? fEndOffset -1 : fEndOffset; |
| return current(); |
| } |
| |
| /* |
| * @see CharacterIterator#current() |
| */ |
| public char current() { |
| if (fOffset <= fIndex && fIndex < fEndOffset) { |
| try { |
| return fDocument.getChar(fIndex); |
| } catch (BadLocationException x) { |
| } |
| } |
| return DONE; |
| } |
| |
| /* |
| * @see CharacterIterator#next() |
| */ |
| public char next() { |
| if (fIndex == fEndOffset -1) |
| return DONE; |
| |
| if (fIndex < fEndOffset) |
| ++ fIndex; |
| |
| return current(); |
| } |
| |
| /* |
| * @see CharacterIterator#previous() |
| */ |
| public char previous() { |
| if (fIndex == fOffset) |
| return DONE; |
| |
| if (fIndex > fOffset) |
| -- fIndex; |
| |
| return current(); |
| } |
| |
| /* |
| * @see CharacterIterator#setIndex(int) |
| */ |
| public char setIndex(int index) { |
| fIndex= index; |
| return current(); |
| } |
| |
| /* |
| * @see CharacterIterator#getBeginIndex() |
| */ |
| public int getBeginIndex() { |
| return fOffset; |
| } |
| |
| /* |
| * @see CharacterIterator#getEndIndex() |
| */ |
| public int getEndIndex() { |
| return fEndOffset; |
| } |
| |
| /* |
| * @see CharacterIterator#getIndex() |
| */ |
| public int getIndex() { |
| return fIndex; |
| } |
| |
| /* |
| * @see CharacterIterator#clone() |
| */ |
| public Object clone() { |
| DocumentCharacterIterator i= new DocumentCharacterIterator(); |
| i.fDocument= fDocument; |
| i.fIndex= fIndex; |
| i.fOffset= fOffset; |
| i.fEndOffset= fEndOffset; |
| return i; |
| } |
| } |
| |
| |
| /** |
| * The document character iterator used by this strategy. |
| * @since 2.0 |
| */ |
| private DocumentCharacterIterator fDocIter= new DocumentCharacterIterator(); |
| |
| |
| /** |
| * Creates a new default text double click strategy. |
| */ |
| public DefaultTextDoubleClickStrategy() { |
| super(); |
| } |
| |
| /* |
| * @see ITextDoubleClickStrategy#doubleClicked |
| */ |
| public void doubleClicked(ITextViewer text) { |
| |
| int position= text.getSelectedRange().x; |
| |
| if (position < 0) |
| return; |
| |
| try { |
| |
| IDocument document= text.getDocument(); |
| IRegion line= document.getLineInformationOfOffset(position); |
| if (position == line.getOffset() + line.getLength()) |
| return; |
| |
| fDocIter.setDocument(document, line); |
| |
| BreakIterator breakIter= BreakIterator.getWordInstance(); |
| breakIter.setText(fDocIter); |
| |
| int start= breakIter.preceding(position); |
| if (start == BreakIterator.DONE) |
| start= line.getOffset(); |
| |
| int end= breakIter.following(position); |
| if (end == BreakIterator.DONE) |
| end= line.getOffset() + line.getLength(); |
| |
| if (breakIter.isBoundary(position)) { |
| if (end - position > position- start) |
| start= position; |
| else |
| end= position; |
| } |
| |
| if (start != end) |
| text.setSelectedRange(start, end - start); |
| |
| } catch (BadLocationException x) { |
| } |
| } |
| } |